3Netherlands Institute for Neuroscience, Royal Dutch Academy of Arts and Sciences, Meibergdreef 47, Amsterdam, The Netherlands

Correspondence should be addressed to either Laure Rondi-Reig at the above address or Eric Burguière at his present address:
McGovern Institute for Brain Research, Massachusetts Institute of Technology, 46-6133, 43 Vassar Street, Cambridge, MA 02139.laure.rondi{at}snv.jussieu.fr or eric_b{at}mit.edu

Author contributions

Disclosures

Received April 26, 2010.

Revision received May 24, 2010.

Accepted July 26, 2010.

This work was supported by grants from the ACI Neurosciences Intégratives et Computationnelles (NIC 0083), Fondation Recherche Médicale (programme Longévité Cognitive et Neurosensorielle-DLC20060206428), and Agence Nationale de la Recherche (ANR Young Researcher 07-JCJC-0108-01) (to L.R.R.); French Ministry of Research and Lilly Foundation fellowships (to E.B.); and Dutch Medical Research Council (ZON-MW), Dutch Scientific Council (NWO), European Union Research Program (SENSOPAC, C7, and CEREBNET), Prinses Beatrix Fonds, and Neuro-Bsik (to C.I.D.Z.). We thank Vanessa Gautheron, Boris Goncalves, and France Maloumian for technical support and Mark Howe for careful reading of the manuscript.

Correspondence should be addressed to either Laure Rondi-Reig at the above address or Eric Burguière at his present address:
McGovern Institute for Brain Research, Massachusetts Institute of Technology, 46-6133, 43 Vassar Street, Cambridge, MA 02139.laure.rondi{at}snv.jussieu.fr or eric_b{at}mit.edu